Kiln, furnace, &amp;c.



H. .ROBINSON @a C. STEADMAN. v

mm1, PURNAGE, m. APPLIATION FILED AUG. Il, 19Q9. @yl @423g Pafanted'ot. 4 1910.

f1.0. RoBmsoN a o. STEADMAN. MLN, FURNAGB, 50. APPLICATION FILED AUG. 11, 1909.

4 SHEETS-SHEET 2.

l l I l H. 0. ROBINSON L C. STEADMA.

KILN, PURNAGE, 6m. APPLICATION IILEILAUG. ll, 1909.

4 SHEETS-*SHEET 3.

@mig

@twg

H. 0. ROBINSON lcz'. STEADMAN.

KILN, PURNACB, dw. APPLICATION FILED AUG. 11, 1909.

@N94- mem@ ma. 4;, 3910.

4 SHEETS-SHEET 4;

f 1 l g 1 im@ @i To all whe/m Be it lino son, a i" resident or and Cinusirori the King Salem, cour'A chusets, hai/i Kilns, Furi c is a speeiiieation.

rlhis invention relates to kilns or iiiurnaees for burning bricks7 tiles, other clay goods, and ceramicsD and for the drying or calciuing oi' various materials7 and the invention has particular reine-rence to ierced draft kilns.

rlhe object of the present invention is to provide a kiln or furnace for b "ling briclr and other materials requiring calcination in which the rate and nature oi the combustion may be clearly and easily regulated Whereby a uniform and. superior quality of product is secured.

Another object or' the invention is to vide a kiln or Pifurnace the ope 'ation of which Will result in economy of labor by expediting the process of burning, and to secure economy of iuel by proi'fiding means whereby different kinds of coal7 anthracite or bituminousi or coke oreolie braize or refuse containing su'licient combustible earbon may be used in the furnaces to generate the necessary heat. v

A particular object of the invention is to provide a kiln having a tight ash pit under the grates, and a steam jet draft 'lforeer whereby fuels which are loW in cost and which could not be used with a natural draft because of the slow comlnistion7 may be utilized.

A further object of the invention is to provide means whereby, While maintaining the heat of the lriln at the desired high and critical point a suiiicient amount or oxygen maybc introduced to the clay goods to raise their component parts to the higher oxids whereby uniform and pleasing colors are developed in the burnt nzaterials.

To these ends the invent-ion consists in the crmstruction and combination of parts subl in "i View n @sheds/'ing our e inidoriion being brolrt .e the i is a man vierT il. l() deta iframe. llig. i oi iiig. 3, ilig. i i idetail sectional vie-.W oi one of the bars. i3 is a detail sectional vieiv o' and Vr l-, L it entrance. ilig'. Y is a ila. vhe lett hand portion of rig'. l. but on a A v S, 9 and n tue furnace door and 'l is a section en line 1li-ll "5' f ,a tne needle valve ror con- Q saine or similar parts in all oi"Y the views.

The Walls or the lriln indicated at 3.5

and door mhe floor 3.6 is :termed of a series of arch-es which formed with narrow openings or slits ij said clits permitting 'the heat from the fuel which passes along the arches from the grates to escape up into the body o1c the lriin.. l l

it each end of each arcli i a beneath which is an ash pit (l which is air tight as will be hereinafter inscribed. rlhe grates are preferably consti' cted shown in iigs. ll and l?, and comprise a series oi? bars which are suitably mounted on cross pieces 2l, (see T). llach bar has a large number ot apertures which are tapered as shown in lig. 12, the smallest end of the apertures being at the top so that the ashes and 'waste from the tire may readily escape into the ash pit ivithoutclor ing the passages. ll'hese apertures are quite small so as to enable fuel in a if ,ky line state to be utili ized. Preferably the edges of the bars have vertical groo fes any tivo grate bars will have their grooves registerin se as to constitute a, practically uniform arrangement or' draft apertures. We proiliose o employ these grate bars in sections about 'feet long by 3 inches Wide, the apertures having ineh diameter at the s frate 19 Cil top and about inch diameter at the bottoni so that the ashes will fall clear. rl`he proportions described will permit of a total space per grate bar for the passage of air of about 8 square inches.

At the front of each set of grate bars, there is a dead wall 36 and above said dead wall there is a door frame 23 for the door 24. TWe have not attempted to show any par-- ticular fastenings for the doors 24 as they .may be either sliding or hinged doors acedge from which project screws 27, said screws passing through holes formed inthe ash pit door 26, suitable nuts being employed to clam the ash pit door iirnjly to the flange of the rame 25. This provides a very tight closure for the ash pit,said closure never being opened excepting when the run of the kiln has been nished and the fire is to be cleaned out. Of course the ash pit door may be opened however if necessary.

Referring to Fig. 3 it will be seen that the l vertical air trunks 28 are arranged in pairs which trunks are open at their upper ends as shown in Fig. li, the lower ends of said trunks diverging as shown by dotted lines in Fig. 8 and leading to two ash pits, the point of discharge into an ash pit being indicated at 29 in Fig. 7

A header`pipe 30 from any suitable boiler or other source of steam supply runs along each end of the kiln as shown by comparing Figs. l and 3. Each header pipe communicates by a pipe 3l with a branch 32, each branch leading to a needle valve casing 33 which may be of any preferred type.'

In Fig. 13 we show an ordinary form of steam needle valve, the valve proper being indicated at 34 and the handle at 35. rl'he discharge from the needle valve is directly downward into an air trunk 28 so as to induce a current of air into the open upper end of the trunk and force it into the tightly closed ash pit.

Havin described the general structure of the ki we will now describe the operation thereof: After the kiln has been filled with green brick and prepared for burning in the usual way, the valves 3d are slightly opened, causing jets of steam to enter the trunks and entrain air into the air tight ash amera whereby the bricks in the lower part of the kiln are dried and warmed for the later stages of the burning. Then the heat in the furnace of the kiln is gradually raised by opening the steam valve more (increasing the draft) and by firing at more frequent intervals. rIhishigher degree of heat is raised to such an extent and maintained for a period of time as is desired to make the brick or other clay goods of the desired hardness. In our case ninety-six hours from.`

the starting of the res is frequently sufcient to complete the burn in a brick kiln set lifty-ve high.. At all times during the burning, the lires in our furnaces are under most convenient control, a slight turn of the steam valve being all that is necessary to raise or lover the draft and temperature in any arch.y vft is the usual practice of burning with most clays to at 4times admit .air to the arches by opening the doors on the same, and this we are able to do at will; but preferably admit the air by thinning the fuel bed, when so desired, to such an extent that a portion of the air blows through it unconsumed but heated to such an extent that it does not check or crack the goods, as by opening the doors, and we are able in this way to secure a better quality of goods. Furthermore in passing through the fuel bed the steam mingled with the air is decomposed, the hydrogen element burning with a free carrying fiange and the oxygen element uniting with the elementsof the clays to raise them to higher oxids and to produce more pleasing colors than when only dry i air is forced upon the fuel bed.

Having now described our invention what 1. A kiln having a door formed of series of arches, a grate beneath each end-'of each arch, a dead wall located in front' of each grate and approximately in line therewith, a fuel door for each grate havin its lower end resting squarely upon said ead wall, whereby an air tight closure is formed, an ash pit for each grate also provided with an air tight closure, an air trunk located in each front wall of the kiln and having outlets in the ash pits below thedead walls, and means for variably forcing air through said air trunks.

y e 2. A kiln having a iloor'formed of a series v arterie of arches, a grate beneath each end of each' 4 arch, a dead wall located in front of each grate and approximately in line therewith, a fuel door for each grate having its lower end resting squarely upon said dead wall, whereby an airtight closure is formed, an ash pit for each grate also provided with an air tight closure, air trunks arranged in pairs and located in each front wall of the kiln between each pair of arches, said air trunks diverging at their lower ends and each discharging in an ash it below the grate, and means for Variabl y forcing air through said trunks. A

ln testimony whereof we a our signa` tures in presence of two witnesses.

HENRY 0. RUBNSN. C STOPHER STEADMAN.,

Witnesses:

WM. Gf. NASH? FRED Vv'. LEE. 

